Although the Clear Sky Chart shows only 20 to 40% cloud cover[1], the ClearOutside site predicts over 80% of the sky obscured by clouds.[2] WeatherUnderground says 39 to 70%[3] and AccuWeather says ~90% cloud cover.[4] Other paid weather-guessers predict partly or mostly cloudy and most give a five to fifteen percent chance of measurable precipitation.[...]